Proxy Manager от EragonK

Proxy Manager is a powerful Firefox extension designed to simplify proxy management. Easily add, remove, and toggle between multiple proxy settings with a user-friendly interface.

Key Features:

• Add Proxies : Input proxy name and address (IP:Port) to save configurations.
• Manage Proxies: View, select, and remove proxies from a list.
• Toggle Proxy On/Off: Quickly activate or deactivate selected proxies.
• Persistent Storage: Proxies are saved locally for consistent use across sessions.
• Compatibility: Works with Firefox version 91.1.0 and above.

Proxy Manager ensures a seamless browsing experience by applying the appropriate proxy settings based on your selection. Perfect for users who need to switch proxies frequently and efficiently.

Disclaimer: You need to give permission for incognito mode for it to work. working on that, will fixed it in the later versions.
UPDATE: I have fixed this issue in Version 3. No need of incognito mode permissions